90551509 has 2 divisors, whose sum is σ = 90551510. Its totient is φ = 90551508.

The previous prime is 90551501. The next prime is 90551519. The reversal of 90551509 is 90515509.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78322500 + 12229009 = 8850^2 + 3497^2 .

It is a cyclic number.

It is not a de Polignac number, because 90551509 - 2³ = 90551501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90551501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45275754 + 45275755.

It is an arithmetic number, because the mean of its divisors is an integer number (45275755).

Almost surely, 2^90551509 is an apocalyptic number.

It is an amenable number.

90551509 is a deficient number, since it is larger than the sum of its proper divisors (1).

90551509 is an equidigital number, since it uses as much as digits as its factorization.

90551509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10125, while the sum is 34.

The square root of 90551509 is about 9515.8556630500. The cubic root of 90551509 is about 449.0539945615.

The spelling of 90551509 in words is "ninety million, five hundred fifty-one thousand, five hundred nine".